---
title: 'Senior React Native Engineer (Fantasy Sports) at Sleeper'
canonical: 'https://feeny.ai/job/senior-react-native-engineer-fantasy-sports-sleeper-san-francisco-rmq4s611hamw'
type: 'job'
last_seen: '2026-09-09'
---

# Senior React Native Engineer (Fantasy Sports) at Sleeper

- **Company:** Sleeper
- **Location:** San Francisco, CA
- **Employment:** full-time
- **Work type:** hybrid
- **Posted:** 2026-09-05
- **Last confirmed live:** 2026-09-09
- **Apply:** https://jobs.ashbyhq.com/sleeper/3c8a410a-1294-47dc-aea8-8f50fbc9e134

## Job description

About Sleeper:

Sleeper is a rapidly expanding platform for fantasy sports and games, revolutionizing the way sports fans connect and engage. Though once only an NFL fantasy football company, we have continued to expand our offerings over 10+ years of operation with NBA, LCS, and soccer. In Sleeper Picks, our real-money Daily Fantasy Sports (DFS) game, users predict player performance against projections provided by third-party vendors. We are at the forefront of innovation in the sports gaming industry, backed by some of Silicon Valley's top investors.

Role Overview:

You'll be working on our fantasy sports product — season-long leagues, drafts, matchups, live scoring, and the social layer that connects them. It's the core of Sleeper, with traffic that peaks hard on game days and a season calendar that doesn't move. You will play a crucial role in developing our mobile application to ensure scalability, reliability, and quality, impacting millions of dedicated users every day.

Our mobile platform is built on React Native, and has been modernized with TypeScript and many of the leading packages like react-query, react-navigation, and reanimated. We’re looking for an experienced mobile developer who can bring their knowledge and skills to help refine our app; bringing new features, improved quality, and lightning fast performance to our millions of users.

We're hiring at the senior level, but will seriously consider strong mid-level engineers — we care more about what you've shipped and how deeply you understand it than about years on a resume.

Responsibilities:

- Collaborate with designers to understand user requirements and translate them into technical specifications for our fantasy sports product.
- Write clean, maintainable, and efficient code using React Native, TypeScript, and related libraries (React Query, Navigation, Reanimated, etc).
- Troubleshoot and debug complex performance, socket, data caching and other issues.
- Develop reusable UI components and implement a well-structured component hierarchy for the application.
- Integrate front-end components with back-end services using APIs (RESTful or GraphQL).
- Stay up-to-date on the latest advancements in React Native, mobile development best practices, and accessibility guidelines.

Who You Are:

- An active fantasy sports player: you're in leagues each season and have opinions about how the product should work
- 4+ years of mobile application development experience, with React Native as your primary framework
- Desire to take on and own a large scale product with freedom to design and develop a best in class experience
- Proven ability to develop and implement algorithms or systems in a professional setting, with strong coding skills and knowledge of best practices
- Comfortable in fast-paced and ambiguous environments, working inside a large, established codebase
- Hold a degree in Computer Science or have equivalent experience

What We Offer:

- A salary range of $180,000 to $235,000 USD, based on experience, plus benefits including Medical, Dental, PTO, and 401k.
- A small, impactful team environment where you can truly make a difference.
- Support for professional growth with a company backed by leading investors.

## About Sleeper

## Company Overview
- **One-liner**: Sleeper is a mobile-first social fantasy sports platform that connects friends through games like fantasy football, basketball, daily fantasy sports, and pick’em contests.
- **Entity Type**: Private (Series A, total funding $67.3M)
- **Headquarters**: Las Vegas, Nevada, USA (with additional offices in San Francisco, CA)
- **Founded**: 2014
- **Founders**: Henry Leung and Ken Wang

## Core Business
- **Primary industries**: Spectator Sports / Fantasy Sports / Mobile Gaming
- **Target customers**: B2C – sports fans, casual to hardcore fantasy players (primarily in the US, expanding globally)
- **Mission statement**: "Connect people over sports. We're building a digital playground for sports fans and their friends to hang out together."

## Products & Services
- **Fantasy Football**: Traditional redraft, keeper, dynasty, and Chopped Leagues (weekly eliminations). Mobile and web-based SaaS.
- **Fantasy Basketball**: Full season and daily fantasy basketball leagues with live scoring.
- **Fantasy Esports**: Leagues for esports titles.
- **Daily Fantasy Sports (DFS)**: Pick’em contests, survivor pools, bracket challenges.
- **Fantasy Soccer (EPL, La Liga, etc.)**: Season-long and daily formats.
- **Sleeper PICKS**: A simplified pick’em game where users pick winners each week (max payout 1000x).
- **Bracket Mania**: March Madness bracket challenge.
- **AI Content Creator (Contract)**: Product/service for content generation (noted in job postings).

## Market Standing
- **Valuation**: Not disclosed (private company)
- **Key Metric – Total Funding**: $67.3M across 6 rounds (Angel, Seed rounds, Series A led by General Catalyst, Venture round)
- **Key Metric – Annual Revenue**: ~$2.5M (LinkedIn estimate)
- **Notable Investors/Partners**: General Catalyst (Series A lead), Birchmere Ventures (Seed lead), and several angel investors.
- **Growth Signals**:
  - Headcount grew ~40% YoY to 171 employees.
  - Monthly website traffic 1.8M visits, +7.1% monthly, +1.2% yearly.
  - Named #1 overall Sports App on iOS (2024).
  - Expanded into more sports (UFC, F1, Tennis, Golf) via curated content roles.
  - Partnership with influencer Donald “Deestroying” De La Haye.
  - Brand refresh and new logo announced in 2024.

## Competitive Advantages
- **Social-first design**: Sleeper emphasizes group chats, live reactions, and easy friend invites – differentiating from more transactional fantasy platforms like ESPN or Yahoo.
- **Innovative game modes**: Chopped Leagues, Survivor, Pick’em, and Bracket Mania keep engagement high year-round.
- **Mobile-native UX**: Built from the ground up for smartphones, with a modern UI and fast performance.
- **Strong community**: 19.6K LinkedIn followers, high social media engagement, and a loyal user base (bounce rate only 0.3%, 8.6 pages per visit).
- **Multi-sport coverage**: Unlike many fantasy apps that focus only on football or basketball, Sleeper supports NFL, NBA, EPL, La Liga, esports, and more.

## Strategic Focus
- **Content & creator partnerships**: Hiring AI content creators and sports content curators to build original media (e.g., “Kickin' It With Dee” show).
- **International growth**: Expanding into markets like Canada, UK, Spain, Portugal, and Indonesia.
- **Risk & trading (DFS)**: Opening Data Scientist and Software Engineer roles specifically targeting daily fantasy sports risk management and trading.
- **Product design innovation**: Active hiring for Sr. Product Designer and User Research Intern – indicates focus on user experience research and iteration.

## Why Work Here
- **Hybrid/Remote flexibility**: Most roles are listed as Hybrid (in-office for Las Vegas or San Francisco) with some fully remote options. Two physical office locations: Las Vegas HQ and San Francisco.
- **Culture highlights**: Mission-driven (“connect people over sports”), fast-growing startup environment, strong emphasis on engineering quality and product design.
- **Notable perks (from Built In)**: Not explicitly detailed in the search results, but typical startup perks include equity, health benefits, and free snacks/events; the company’s career page emphasizes making an impact.
- **Engineering culture**: 18 technical employees (7% of workforce), tech stack includes TypeScript, Buildkite, Retool. Hiring for Senior Frontend (Mobile), Senior Backend, and Staff Backend roles.
- **Recruiting warning**: Sleeper actively warns about scams – they never ask for money and always conduct interviews via Google Meet.

## Sources
1. [Sleeper Company Page](https://sleeper.com/company)
2. [Sleeper Jobs (Ashby)](https://jobs.ashbyhq.com/sleeper)
3. [Built In – Sleeper Careers](https://builtin.com/company/sleeper)
4. [LinkedIn – Sleeper](https://gt.linkedin.com/company/sleeperhq)
5. [Sleeper Homepage](https://sleeper.com/)

## Other roles at Sleeper

- [Senior Web Engineer (Fantasy Sports)](https://feeny.ai/job/senior-web-engineer-fantasy-sports-sleeper-san-francisco-5jf45ebhzymc) — San Francisco, CA
- [User Research Associate (UX)](https://feeny.ai/job/user-research-associate-ux-sleeper-san-francisco-84emjf2az233) — San Francisco, CA
- [UI Graphic Designer](https://feeny.ai/job/ui-graphic-designer-sleeper-seattle-ymh4pqbq7rj7) — Seattle, WA
- [Computer Systems Analyst](https://feeny.ai/job/computer-systems-analyst-sleeper-seattle-k7jpf5k27gr2) — Seattle, WA
- [Product Design Intern](https://feeny.ai/job/product-design-intern-sleeper-seattle-tq7ksvbspt2p) — Seattle, WA
- [Lifecycle Marketing Manager](https://feeny.ai/job/lifecycle-marketing-manager-sleeper-san-francisco-rq70zcgb6zpj) — San Francisco, CA / New York, NY
- [User Research Intern](https://feeny.ai/job/user-research-intern-sleeper-san-francisco-czgpa23mf1wx) — San Francisco, CA
- [AI Content Creator (Contract)](https://feeny.ai/job/ai-content-creator-contract-sleeper-united-states-8g8ht47w5ac9) — United States
- [Software Engineer, Backend](https://feeny.ai/job/software-engineer-backend-sleeper-san-francisco-2pesr1qdcx6e) — San Francisco, CA
- [Senior Software Engineer, Backend](https://feeny.ai/job/senior-software-engineer-backend-sleeper-san-francisco-gfpg3nrffht1) — San Francisco, CA